Planoohaph co



(5.-GORTON AND G. E. GUSTAFSON.

METAL WORKING MAcHxNE.

APPLICATION F!LED1UNE9.19!6.

THE COLUMNA PLANpaRAPH co., wAsHlNuTON, me.

' Gf GORTONAND G. E. GUSTAFSON.

METAL WORKING MACHINE.

(g1/wanton orOfl u L'zfson G, GORTON AND G. E. GUSTAFSON.

METAL WORKING MAcHmE. APPLICATION FlLED 1UNE9 1915.

1,312,394, PatentedAug. 5,1919.

8 SHEETS-SHEET 3.

Suva/141:07,

G. GORTON AND G. E. GUSTAFSN.

METAL WORKING MACHINE.

Patented Aug. 5,1919.

APPLICATION FlLED JUNE 9.19%6.

8 SHEETS-SHEET 4 H cu.. wAsHmd'roN, u. c.

G. GORTON AND G. E. GUSTAFSON.

METAL WORKING MACHINE.

APPucATmN r1LED1uNE9.19:e.

Patented Aug. 5, 1919.

8 SHEETS-SHEET 5.

y 4Q'. A. 271; .9

5mm/bola Rw @cage Qorlon 3 @Eusgorv WMZ/ Shiraz/m vco., wAsmNnToN. D.. C.

'x m: cuLuMlA PLANUGRAPH G; GORTON AND G. E. GUSTAFSON.

MEI'AL WORKING MACHINE.

APPLICATION FILED JUNE 9. I9I6.

1,312,394. l Patented Aug. 5,1919.

8. SHEETS-SHEET 6.

@mi/Immo '6. GORTON AND G. E. GUSTAFSON.

METAL WORKING MACHINE.

APPLICATION FILED )UNE 9. 1916.

Patented Aug. 5, 1919.

3 SHEETS-SHEET 7- THE COLUMBIA PLANOGRAPH cO., WASHINGTON. DNC.

G. GORTON AND G. E. GUSTAFSON.

METAL WORKING MACHlNE.

APPLICATION F|LED1UNE9| 1916.

Patented Aug. 5, 1919. 7f s SHEETS-SHEET' B.

r e orion 3 MSM am UNITED STATES PATENT FFICE.

GEORGE GORTON AND GEORGE E. GUSTAFSON, 0F RACINE, WISCONSIN; SAID GUSTAF- SON ASSIGNOR T0 SAID GORTON.

METAL-WORKING MACHINE.

Specification of Letters Patent. Patented Aug, 59 1919,

Application filed June 9, 1916.- Serial No. 102,713.

To all whom t may concern.'

` Be it known that we, GEORGE GoRToN and GEORGE E. GUsTlwsoN, citizens of the United States, and residents of Racine, county vof Racine, and State of Wisconsin, have invented certain new and useful Improvements in and Relating to Metal-Working Machines, of which the following is a specification.

j This invention relates to certain improvements in and relating to routing andv other metalworking machines; and the objects Vand nature of the invention will be readily understood by Ithose skilled in the art in the light of lthe accompanying drawings` illustrating what we now believe to be the preferred mechanical expression and embodiment of the invention from among other constructions, arrangements and com-binations within the spirit and scope thereof.

An object of the invention is to provide alpparatus peculiarly adapted for accurately routing or cutting Ithe grooves in fuse rings for explosive shells.

A further object of the invention is to provide apparatus for quickly and accurately forming grooves in the rings of time fuses for explosive shells, embodying adjustments that can be quickly and easily made to produce a groove of the desired diameter and a bridge of the desired length between the groove ends.

A further object of the invention is to provide durable and eiiicient apparatus for quickly and accurately grooving time fuse rings, involving features capable of adaptation for various purposes other than for routing or grooving.

A further object of the invention is to provide an improved metal wor-king machine capable of various adjustments and of performing diiferentkinds of work.

Av further object ofthe invention is to provide certain improvements in arrangements and combinations of parts 'and features for the production of a highly eflicient metal working machine.

The invention consists in certain novel features in construction and in arrangements and combinations as more ful-ly and particularly set forth and` speciiied hereinafter.

Referring to the accompanying drawings:

Figure 1, is a top plan of the machine, the wor; holder mechanism and headstock` being shown in horizontal section, and in abnormal position with the axis of rotation of the work holder alined .with the axis of rotation of the cutter. i

Fig. 2, is a central longitudinal vertical section through certain lparts.

Fig. 9., is a detail section on the line aasa, Fig. 2.

Fig. 3, is a detail verticalsection on the line 3*3, Fig. l.

Fig. 3a, is a detail section on the line 3a- Sa, Fig. 3. v

Fig. 4, is a detail radial section through a portion ofthe head stock and rotary drum.

F ig. 5, is an end elevation of Vthe machine.

Figs. 6 and 7, are face views of fuse rings that have been grooved on the machine of this invention, the rings being more or less diagrammatically illustrated. j

Figs. 8, 9, and 10, are face, edge and sectional views of the face plate, chuck, and clamp arranged on` the `front end of the rotary work holder drum. l

Fig. ll, is a sectional elevation of an automatic machine embodying the invention.

Fig. 12, l of Fig. 11, the headstock being in abnormal adjustment with respect to the axis of the cutter. A j

Fig. 13, is a section on the line 13-13, Fig. 12. j

Fig. 14, is a detail perspective somewhat diagrammatically illustrating certain parts ofthe machineof Figs. 11 and 12.* Fig. 15, is a detail perspective of a work holder block or chuck having an index pin to fit agage hole in the side of the work. Y The Vmachine ofvour Ainvention is characterized in whole or, in part by a constantly rotating spindle or arbor at one end provided with a chuck to receive the rotary metal working bit or tool; said arbor being mounted in and carried by a slide orcarriage movable in a line parallel with the axis of rotation of the arbor and provided with means for moving the carriage to carryl the tool into and from `operative relation or position with respect to the work; workholding means being provided to clamp and hold the work in certain fixed relation with respect to the tool and to rotate the work on an axis parallel with the axis of rotation of said tool, stops and adjusting `means being provided whereby the work can be rotated through an arc of any4 desired numberfof degrees from an accurately predetermined starting point to an accurately preis a. sectional plan of the machine' determined stopping point, and whereby the angle between said starting and stopping points can be accurately predetermined and whereby the angles between said starting and stopping points and a gage or index on the work can be accurately predetermined, mechanism being provided for adjusting the work holder transversely or horizontally to shift its axis of rotation into alinement with or to either side of the vertical longitudinal plane of the axis of rotation of the tool to a predetermined radial distance between the tool and the axis of rotation of the work, while maintaining the axial lines on which the tool and the holder revolve in the same horizontal longitudinal plane; the work holding means comprising a hollow headstock of enlarged diameter adjustable transversely of and normally iixed on a suitable main supporting base that also supports the carriage for the tool rotating arbor, a rotary work holder drum or spindle projecting outwardly and longitudinally through a center opening in the vertical side wall of the headstock that is adjacent to the tool, and at its outer end having a vertical face, main or swivel plate normally clamped rigidly thereto but capable of a limited rotary adjustment thereon concentrically with the axis of rotation of the work holder spindle, and provided at the center of its outer side with a removable work holderplate or chuck, said swivel plate being provided with a clamp for holding the work centered on said chuck, either the main plate or the chuck being provided with an index or other means to enter a gage or index socket or hole in the work to hold the work against rotary movement on the chuck and to determine the points at which the toolbegins and ends its work on the face of the work, the radial distance of such starting and stopping or finishing points from the center of the work being determined by the transverse adjustment of the headstock; the inner end of the work holder spindle or drum being formed or provided with a vertical disk or flange rigid therewith and of enlarged diameter with respect to the spindle and arranged within the headstock between its opposite vertical end walls and being provided with an annular toothed rim fixed thereto and forming the peripheral portion thereof, the main bearings for the spindle or drum being arranged between the vertical sidefaces of said disk and the opposite end walls of the headstock to sustain the longitudinal and radial A thrusts of the drum or spindle, said main bearings being of the cone type and embodying a longitudinally adjustable bearing ring to take up wear; the spindle or drum beingy driven through the medium of a pinion shaft entering and mounted in the outer edge portion of the head stock and having a pinion therein meshing with said large gear of the spindle, the headstock being provided with and carrying a gear box supporting reducing gear and slip clutch driving means for said pinion shaft; the rear end of the drum or spindle within the headstock being provided with permanently located starting point and finishing point stops traveling in circles of different radii; the rear wall of the headstock being provided with a permanently located stop to coperate with one of said stops of the head, and with a stop rotatably adjustable concentrically with the axis on which the drum rotates to coperate with the other stop of the drum7 said two stops carried by the headstock being movable to and from operative position and being spring held normally in operative position; the angle of said two stops of the headstock with respect to the axis of rotationof the spindle determining the angle of or dist-ance between the starting and nishing points of the tool on the work.

In the particular embodiments illustrated, we show a horizontally-elongated hollow or internally recessed heavy supporting frame, bed or base 1,- at one end formed with an undercut slideway 2, extending completely across its top side, and preferably including a gib 3, provided with suitable clamping bolts. This horizontal slideway receives the horizontal supporting foot,vslide or base Li, of the vertical headstock which risesY therefrom and is arranged transversely with respect to the length of the base. The base 4, is shown formed integral Vwith the main section of the headstock, and having beveled longitudinal edges fitting under the longitudinal undercut edge walls of the slideway, one of which is formed by the gib so that the headstock base can be rigidly clamped in the desired adjustment on the machine base or frame. The base 4L, is formed with a central lug 5, depending in the machine base and at its opposite ends engaged by the opposite stop and adjusting screws 6, having their heads exposed at the exterior of the opposite longitudinal sides or edges of the machine base to receive an adjusting wrench. These screws are adjustable through tapped holes in the vertical longitudinal walls of the machine base. N hen the gib is loosened the headstock can be accurately adjusted transversely of the base by manipulating the two screws 6, which will thenl maintain the headstock in the desired adjustment after the gib has been tightened.

The headstock is approximately of the form of a vertical approximately circular hollow box or housing comprising a vertical front end or main section 7, and a vertical rear end section 8, clam ed to the iront section by exterior longitu inal bolts 9.

Each section is annular in forni and comprises a vertical end wall and an annular portion of the circumferential wall of the box, so that when clamped `together the edg'es of said annular portions tightly meet to form a lubricant retaining trough.

The main section 7, has a central longitudinal opening receiving the work holder spindle or drum 10. The rear end of the drum is radially enlarged within the headstock by exterior annular flange 11, provided with exterior annular gearing 12, so that the enlarged rear end of the spindle constitutes a large spur gear within the head stock, the flange forming the body of the gear wheel.

In the example illustrated, the front side face of the flange 11, is formed with an annular V groove 13, concentric with the axis of rotation of the spindle, while the vertical front wall of the housing is formed at its inner side with an annular V-rib 14, fitting said groove. The rear face 15, of the flange is in this instance, shown flat and vertical and an adjustable bearing ring 16, is pressed thereagainst by stop and adjusting screws 17, 18, carried by the rear end wall of the headstock.

The bearing ring and the groove and rib constitute the main longitudinal and radial thrust sustaining bearings of the spindle, and wear can be' taken up by adjusting the ring; as set forth in Patent No. 1,170,890, issued to George Gorton under date of February 8, 1916.

The front wall of the headstock section 7, forms a more or less extended oil distributing and retaining bearing around the cylindrical portion of the spindle projecting forwardly through said wall.

The large gear of the work holder spindle or drum is rotated by a pinion 20, meshing therewith and arranged within the headstock, and fixed to a shaft 2 1, driven by large gear 22, meshing with and driven by pinion 23, on the drive shaft 24. In the instance illustrated, the drive shaft 24, is driven by a suitable belt through the niedium of pulley 25, loose on the shaft and operatively coupled theretothrough the medium of suitable slip clutch mechanism such asy friction washers 26, engaging the ends of the pulleyhub and a collar 27, fixed on the shaft and another collar 28, rotating with but longitudinally adjustable on the shaft and held under tension toward the pulley hub by spring 29, and adjustable nut 30. The arrangement is such that the pulley can be constantlyV driven by its belt to drive the work holder spindle against the resistance of the tool on the work. rlhe pulley will continue to Vrevolve when shaft 24, is held Iagainst rotation by the engagement of stops of the headstock and work holder spindle,- As soon as such stops are disengaged the friction or slip clutch connection between the. pulley and shaft 24, will cause the rotation of said shaft and consequently of the spindle with the pulley.

In this instance, we show the pinion shaft 2l, extending longitudinally into the head stock through the peripheral por-tion of its rear section 8, and mounted in a. bearing hub 31, fitted and clamped in said section 8, by tubular split clamping portion 31 thereof, and projecting rearwardly therefrom and supporting a ,gear box or housing 32, inc-los ing the reducing gearing 22, 23, and provided with a bearing hub 33, for the drive shaft 24; the slip or friction clutch connection and the drive pulley being arranged yat the exterior of the gear box and its bearing hubs. It will hence be noted that said gear box is supported by and moves with the headstock during the adjustment thereof. The front end of therotary work holder spindle is formed with a vertical end face and with a central reduced-diameter stud or hub 34, projecting forwardly from said end face. A pair of bolt holes or slots 35, 36, open through diametrically opposite portions of said end face and said slots are spaced uniform distances from the spindle axis of ro tation. These slots are parallel and extend longitudinally through Athe outer end portion of the spindle and at their rear ends openinto diametrioally opposite radial recesses in the portion of the spindle in advance of the headstock.

A usually circular disk or plate 37, is removably seated against the front end face of the spindle and is formed with a central forwardly projecting hub 38, and with a central longitudinal cylindrical bore or opening 39.- The rear end of this bore receives the stud 34, to center and aid in supporting the plate. rllhe plate is also provided with studs 35a, 36, fixed todiametrically opposite portions of the plate and projecting rearwardly therefrom and passing removably through the slots 35, 36. This plate is clamped rigidly to the spindle by the angular heads 40, on the rear ends of said studs and located and accessible in said radial recesses in the spindle.

By loosening the studs, the plate can be turned on the stud 34, as a center through a certain number of degrees, and this limited rotary adjustment of the plate on the spindle is rendered possible by the ino-vement of the studs or bolts 35a, 36, in the slots or elongated bolt holes 35, 36. lThe plate can be also adjusted through van angle of 180o by removing the studs, so that the plate can be movedforwardly from the spindle end and then rotated a half revolution and re-ap'plied to the spindle with the stud 35a, in the slot 36 and the stud 36a, in slot 35. The plate is then clamped in this position by tightening the studs. u

- Means are provided to clamp and hold the work at the front face of the plate 37, in proper posit-ion 4to be worked by the cuttin'g tool. For instance, we provide for this purpose, a work holder or chuck composed of a longitudinally-hollew plate, plug or block 41, fitted to the front end of the hub 38 and centered thereby and having a cylindrical portion fitting therein. This chuck is formed and shaped to conform to the Work to be handled and the action of the cutter thereon. For instance, in the example illustrated,this chuck is particularly inten-ded to receive and center certain rings forming portions of fuses for explosive shells, and hence the front side of the chuck is formed with an annular rabbeted portion 42, providing a seat to receive the work (the fuse ring) and a center hub to snugly enter the center opening of the ring.

7e also provide a clamp to hold the fuse ringr (the work) on the chuck. This clamp comprises a clamp lever fulcrumed between its ends on axis 44, carried by lugs 45, rigid with and projecting forwardly from the plate 37. The lever is arranged radially of the plate 37, and in the front thereof and the inner end 46, of the lever is forked or bifurcated and arranged in advance of the chuck. The arms of the fork are arranged to engage diametrically opposite portions of the front face of the fuse ring on the chuck in such manner as not -to interfere with the free operation of the cutting tool on the front face of the ring, and yet so as to rigidly clamp the ring against t-he chuck. The forked inner end of the clamping lever moves rearwardly toward the ring and forwardly away from the same, as the lever rocks on its fulcrum. A spring 48 is attached to the outer end 49 of the lever and constantly tends to swing the lever from clamping position, while a cam shaft 50, mounted in lugs rigid with the plate 37 is provided with a cam 51, to engage the outer end 49 of the clamping lever and force the lever to clamping position; The rock or cam shaft. 50, is provided with a radial handle 52, and the cam has a fiat side. The shaft can be rocked by the handle to bring the flat side of the cam opposite the outer end of the lever so that the spring can swing the lever to inoperative position with its forked end moved forwardly a sufficient distance from the chuck to permit removal of a ring from the chuck, and the location of another ring thereon. The cam shaft is then rocked by its handle to tightly wedge the cam against the lever and thereby force the forked end of the lever rearwardly against the fuse ring to tightly and rigidly lock said ring to and on the chuck for operation by the cutter.

The fuse ring is indicated by the reference letter a.

Where the fuse ring to be grooved is formed with a radial gage or index socket l),

in its periphery or edge, the plate 37, is provided with a removable front bracket 54, having a post 55, to removably fit in either one of two spaced sockets 56, 57, in and open at the front side of the plate and also provided with a housing carrying a springpressed longitudinally movable pin or plunger 58, arranged radially with respect to the axis of rotation and the fuse ring and adapted to enter said gage socket 5, of the fuse ring on the chuck.

There the work, such as fuse ring a, to be grooved has a gage or index hole or socket c, in a side or end face thereof, we usually provide the chuck or work holder plug 41 with a properly positioned forwardly projecting index or gage pin 59, to removably enter the hole c, of the fuse ring and determine the location and angles of the grooveI ends with respect to the gage hole and each other.

The gage pin 59, is driven into either one of the two holes 59a, 59, of the chuck according to the direction in which the work is to revolve with respect to the position of the cutting tool. The machine illustrated,

is provided with a system of stops for the rotary work holder, for controlling or predetermining the points at which the cutter or tool begins and ceases action on work rotating on an axis parallel, but out of alinement, with the axis of rotation of the tool or cutter. Such stop arrangement is of peculiar utility in a machine for cutting or' routing the powder and vent grooves in fuse rings.

1n the particular embodiments illustrated, the stops are arranged in the headstock between the rear end thereof and the rear end of the rotary work holder spindle. For instance, the said spindle is provided with a stud or post 60, rigid with and projecting rearwardly from the rear vertical side face of the gear-body-forming flange 11, of said spindle. This post 60, is arranged outwardly beyond the adjustable bearing ring 16 and forms a stop or abutment fixed to the spindle and having a circular path of movement in the headstock concentric with but of greater diameter than said bearing ring. Said spindle is also provided with another post or stud 61, rigid with and projecting rearwardly from the work holder spindle within the open center of the adjustable bearing ring 1G, and forming a stop or abutment iixed to the spindle and having a circular path of movement within the headstock, concentric with but of less diameter than the inside diameter of said bearing ring.

If so desired, the stops or abutments 60, 61, can be located approximately in the same radial line with respect to the axis of rotation of the work holder spindle. The stop or abutment 61, is alined, longitudifrom the path of movement nally of the 1work holder spindle, with the elongated bolt hole or slot 36, in the front end of the spindle, which slot receives either one of the studs 35a, or 36a,` of the work holder head or main plate 37, adjustably secured to said spindle by said studs and their nuts. The rear end wall of the headstock is provided with means coperating with the work holder abutment 60, toy determine the point at which the cutter or other rotary tool ceases operation on the work, and said rear wall of the headstock is also provided with means to coperate with work holder abutment 6l, to determine the point at which said tool begins operation on the work. For instance, we show a passage through the rear wall 8, of the headstock with a plunger 62, longitudinally movable therein and yieldingly held by spring 63, at its limit of forward movement into the head stock with its inner end projected into the path of movement of the abutment 60, to form a stop to engage said abutment and prevent rotation of the work holder. At the exterior of the headstock we have provided a handle or lever 64, fulcrumed to the headstock and having a forked end engaging behind an exterior head of said plunger, and also having an accessible handle end by which the operator can swing the lever against the tension of lpring 63, to withdraw the stopforming inner (front) end of the plunger of abutment 60, to permit the work holder spindle to continue on its rotary movement. As soon as the handle 64 is released the spring returns the plunger to normal operative work holder stopping position. This plunger 62 provides a stop for a xed or permanently located work holder stopping station in the circle of movement of the abutment 60, and in the example disclosed this stopping station determines the point at which the tool ceases operation on the work.

On the other hand, we provide an adjustable stop to coperate with the abutment 6l, and this adjustable stop can be shifted along a path concentric with the axis of rotation of the work holder, to vary the angle of its position with respect to the fixed stop 62, and to predetermine the point at which the tool begins operation -onthe work. To this end, iixed portion 8, of the rear wall of the headstock is formed with a central circular' opening occupied by a circular plate or head 66, that is rotatably mounted in and closes said opening. This plate 66, is normally clamped rigidly to the headstock wall 8, by clamping bolts 67, having their tightening nuts accessible at the outer side of the headstock. When the nuts of bolts 67, are loosened said plate 66, can be rotated in the headstock opening.

rilhc work holder abutment 6l, travels in a circular path immediately in front of plate 66, and said plate carries a stop normally projecting into said path of movement to engage abutment 6l, vand stop the rotation of the work holder. This stop is formed by the inner or front end of a plunger 68, yieldingly held by spring 69, projected forwardly into operative position. A hand lever 7 0', is fulcrumed to and exposed and accessible at the outer side o-f plate 66 and is coupled tothe outer end of plunger 68, for withdrawing the same from, operative position in |the salme manner as hand lever 64, withdraws its plunger from operative position.

The plunger 68, extends through the plate 66, at a point between the center and periphery of the plate and hence rotary adjustment of the pllate throws the plunger (stop 68) forwardly or rearwardly in the circular path of movement of work holder abutment 6l, to increase or diminish the angle between the starting and finishing points of the operative path of movement of the too-l on the work, determined by the angle of the path of movement traveled by the abutment 60, after it leaves stop 62, `and until abutment 6l, engages stop 68.

In order to secureextreme accuracy in the adjustment of stop 68, we preferably mount Jthe plunger eccentrically in a sleeve 7l', extending through and rotatably yadjustable in a hole in the late 66, and provided with a clamping nut 72, by which the sleeve can be claneped to the plate in fixed position. It will .be understood that by loosening the nut 72, the sleeve can be turned in the proper direction to move the stop forwardly or rearwardly to secure extreme refinement or accuracy of adjustment.

In the examples illustrated, where the machine is peculiarly adapted for cutting, routing 0r milling, the powder and vent grooves in fuse rings, we provide a rotating, routing or cutting tool or bit 70, carried by a suitable chuck 7l, at the end of arbor, spindle or shaft 72, and forming a longitudinal continuation thereof toward the work on the work holder. The arbor 72, .is arranged with its axis of rotation parallel with and in the same horizontal plane as the axis of rotation of the work holder, and said arbor is mounted and revolves in and is carried by a sleeve 73. The end portion of this sleeve adjacent to the work is longitudinally slidable in the bore lof a hub or box 74 formed integral with post or pillar 75, rising from and integral with the main bed 1, of the i raog v rack 87, parallel with collar 92, clamped a drive pulley 79, is arranged beyond the opposite end of the sleeve and is secured on the end of the arbor projecting beyond said end of the sleeve. i

If so desired, an idler pulley 80, can be alined with and closely adjacent to the outei` end of the arbor driving pulley 79, and these two pulleys are 'so arranged that the driving belt (not shown) can be readily slipped from one pulley to the other by a fork 80.

We show the idler pulley 80, carried by and loosely mounted on a stud or stub shaft 81, fixed in and projecting longitudinally froma sleeve 82, -alined with the sleeve 7 3, and extending through and longitudinally slidable in the bore of a box 83, integral with the post or pillar 84, rising from and integral with bed 1.

The two slides 73, S2, are held in fixed relation and are moved (as one slide) by a vertically arranged yoke located between the pillars 75, 84, and their top boxes 74, 83, and at its upper end formed with a pair of' alined spaced split clamps or clamping collars 85, receiving the adjacent ends of the sleeves or slides 73, 82, and tightly clamped thereon, with the two pulleys 79, SO, exposed between said clamps. The yoke rigidly joins the two clamps 85, together and is formed with a central depending portion S6, at its lower edge provided with a horizontal the longitudinal axis of the arbor 72. A pinion 88, meshes with said rack, and this pinion is fixed on a sha-ft 89, arranged transversely of and mounted in the machine bed 1, and at one end projecting at the operators (front) side of said bed and there provided with a radial handle or lever 90, by which the shaft can be rocked or rotated to slide the sleeves 7 3, 82,.toward and from the work and to carry the too-l 70, to and from operative position with respect to the work. A dog or detent mechanism is preferably provided to normally hold the slide carryingthe tool and its operating means, in either operative position or withdrawn position. For instance, we show the handle or lever 90, provided with and carrying a spring pressed .longitudinally movable dog or detent 91, radially arranged with respect to the shaft S9, and having a beveled or rounded inner end yieldingly held bearing against the periphery of a circular flange or in normal fixed position to the machine bed and having a notch or depression 93, into which said detent snaps when the slide is at its limit of' movement toward the work with the tool 70, at full cutting depth, and another notch or depression 94:, into which said detent snaps when the slide is in withdrawn position with the cutter held out of operativeI position with respect to the work. The detentand notch 93, thus form a lock holding the cutter working at full or proper depth and against backward play or vibration. The detent and notch 94k, f'orm means to lock the slide in withdrawn position and against accidental movement toward the work. Vhen the proper pressure is applied to the handle 90 the detent will ride up out of' the notch and permit swing of the handle and movement of the slide toward and from the work. The notched flange or keeper 92, is shown in the form of a split clamping collar mounted on a hub rigid with the bed and provided with a clamping bolt 95, for locking the collar on the hub in the desired adjustment. By loosening the bolt, the collar can be turned ou the hub to bring the notch 93, at the desired angular position to hold the tool at the desired cutting depth with respect to the work. When the desired adjustment is made, the bolt is tightened to lock the collar in fixed position.

o accurately and positively limit the movement of the tool 70, toward the work, and to positively determine the cutting depth thereof, any suitable adjustable stop mechanism can be provided to limit the movement of the slide, carrying the tool, toward the work. For instance, the post 75, that is adjacent to the work holder is formed with a lateral lug having a vfixed abutment 9G, facing toward the slide moving` yoke, and the yoke is provided with a longitudinally adjustable bolt or pin 97, alined with said fixed abutment and parallel with the axis of rotation of the tool, and having its front end arranged to engage said abutment and stop further forward movement of the slide and tool when the tool has reached its desired full cutting` depth. This bolt 97, is longitudinally threaded for accurate adj ustment through a nut carried by the yoke, and is also formed with a longitudinal groove to receive a pin fixed to a knurled finger wheel 98, having a non-threaded bore loosely receiving rotated by the wheel to secure the desired accurate adjustment, when the clamp 99f is loosened. When the adjustment is secured. the clamp 99, is tightened to rigidly hold the bolt in the ldesired adjustment. r1`he side of' the yoke is formed with lugs properly bored to receive the bolt 97 and form the nut, and one of these lugs is split and provided with a tightening screw to form the clamp 99. rl`he loose finger wheel 98, is arranged between the two lugs and hence held against longitudinal movement.

le also illustrate an embodiment of the invention wherein provision is made for automatically withdrawing the cutting tool from operative relation with respect to the work when the tool has arrived at the predetermined finishing point on the work, and for automatically withdrawing the stop that predetermines the point at which the tool the bolt. The bolt can be" starts operating on the work when the tool is brought to Operative position with respect to the work so that the work holder `will begin rotating when the tool has reached its full working depth in the work.

In this embodiment, the yoke that controls the position of the cutting tool slide, is provided with an upwardly extending arm 105. rigid therewith, land a horizontal slide rod 106, has one end clamped t-othe upper end of said arm, and extends therefrom longitudinally of the machine and above the operating parts thereof to and is slidable through an eye or guide 107, projecting upwardly from the headstock. The free end of the slide rod above the rear end of the headstock, is provided with a depending beveled edge, keeper, flange or plate 108.

A comparatively heavy coiled expansive spring 109, is arranged en the slide rod with oneend bearing against the eye 107, and the other end bearing against an abutment 110, fixed on the slide rod, so that the spring is A compressed between said eye and abutment 25` with a constant tendency to force the cutting tool slide in a direction away from the werk and the tool from operative position. This spring is of sufhcient power to move the slide 'and connected parts and hence carry the tool ,from operative position.

Tf so desired, we can employ a spring 111, between the yoke, and the outermost pillar or post ofthe machine bed to cushion the stroke of the slide away from the work,

In this particular embodiment. when the cutting tool slide is forced toward the work bythe manual operation of handle 90, the

spring 109, is compressed, and the beveled edge'108,engages the beveled upper end 62", of a vertically reciprocatory locking` bolt or 'catch 62, mounted in a proper housing in the rear wall of the headstcck, and depresses said bolt against the tension of its spring 63a, until the edge 108, has slipped rear wardly past the beveled end 62. whereupon the bolt moves up in front of edge 108, and the locking shoulder 62, of the bolt holds the slide bar 106 against return move* ment and consequently the tool slide locked in forward position with the tool in operative position with respect to the work. This bolt 62, thus holds the `tool in position at Afull working depth in the` work, until (in the rotation ofthe work) the Vtool reaches the predetermined point on the work at which its operation thereon has been completed, whereupon suitable means act on the bolt 62, to force the same downwardly, against the tension of its spring, until the shoulderl 62d, clears the edge 108. and the means locking the slide bar 106, against return movement is thereby released and the spring thereupon instantly expands and throws back the slide and withdraws the cutting vtool from operative position. In

-means are provided to withdraw this embodiment, instead of employing an abutment on the rot-ary work holder and a plunger stop on the headstock to prevent further rotation of the work when the cutter has completed its operation on the work, the cutting tool when it has completed its operation on the work. and hence the rear end of the work holder spindle is provided with means to withdraw said bolt 62a, when the cutter has completed its operation. This result can be accomplished by forming the rear end 0f the work holder spindle with a rearwardly projecting lug or finger 60. having a V-shaped edge surface or double bevel 60h, to coperate with a correspondingly beveled edge or surface 62h, of the bolt 62, arranged in the circular path of movement of beveled surface 60", and so arranged that when the tool finishes its operation on the work, the beveled edge of the post 60a, will engage the beveled edge 62D, of the bolt and force the bolt inwardly and as the post moves past the same on the continued rotation of the work holder spindle, the post will move from engagement with the bolt and permit the bolt to return to normal operative position under the action of its spring 63a.

The work holder will continue to revolve. after the too-l has been thus withdrawn, until theabutment 61 of the work holder comes into engagement with the adjustable stop 68 of the headstock whereby the work holder is held against rotation as described in connection with the machine of Fig. 1, of the drawings. The work can then be removed from the chuck and another piece of work can be inserted and clamped thereon.

The abutment 6l, and stop 68, are the same as h ereinbefore described, and the stop 68, is adjusted as before described, but in the present embodiment means are provided for automatically withdrawing the stop 68, when the cutting tool has reached its full cutting or operating depth on the forward or opera- 'tive movement of its supporting slide.` For instance, a flange 68a, on the outer end of the stop forming plunger 68, loosely engages the outer surface of a circular head 70a, having a spindle 70b extending through a central passage in the adjustable plate 66. This spindle is slidable longitudinally in said passage and is yieldingly held at its limit of inward movement by spring 70C. This spindle is drawn outwardly to withdraw the plunger 68 (by engagement of the head 70, and flange 68a) from operative position, and permit rotation of the work holder, by an upright lever 70, at its lower end fulcrumed at 70e, to the headstock, and between its ends pivotally joined to the spindle 70h, at 70g,

Vand at its upper end provided with a longillO slide bar 106. This screw t is so adjusted that when the operator manipulates the handle 90, to force the slide and tool toward the work (the work holder being held at rest by the engagement of abutment 61, with stop 68) the rear end of the slide rod 106, will engage the front end of screw TOf, and swing the lever 70d, rearwardly and thus withdraw the stop 68, to permit rotation of the work holder, after or when the tool has reached its full cutting depth in the work at the starting point of its operation on the work.

The tool will then be held in operative position and the lever 70d, will be held swung back with the stop 68, withdrawn, by the bolt 62a, engaging the catch 108, of the slide rod 106. These parts will thus be held until the operative stroke or action of the tool on the work is completed, whereupon the lug 60a, of the work holder will automatically operate the bolt 62a, to release the slide bar 106, and the forward movement of the slide bar, will permit forward swing of the lever 7 0d, under power of spring 70C, to restore the stop 68, to operative position whereupon it engages abutment 61 as the work holder completes one revolution to bring the work holder to rest at the point where the tool be gins its operative stroke on the new piece of work to be then placed on the chuck.

Where the machine is adjusted and arranged to produce vent and powder grooves in fuse rings, the distance the work holder travels after the tool is withdrawn and until the abutment 61, engages the stop 68, determines the length of the bridge between the ends of the groove cut in the ring.

In order to permit the adjustment of the headstock on and transversely of the machine bed toward and from the operators position, to determine the radius of the circular path of the action of the tool on the work, or to determine the direction of rotation of the work with respect to the tool, the slide bar. 106, which moves laterally with the headstock during such adjustment, is adjustably secured to the upper end of the post or arm 105. For instance, the upper end of the arm 105, is formed with a horizontal slot 112, elongated in the direction of such adjustment, and the adjacent end of bar 106, extends through said slot and is normally clamped rigidly to arm 105, by nuts 113, the end of the bar being threaded to receive the nuts. When the nuts are loosened, the bar can slide in and longitudinally of the slot, as the headstock is adjusted. When the desired adjustment has been made, the nuts are again tightened.

In this last described embodiment, wherein the automatic withdrawal of the cutting tool is provided for, the adjustments are attained and the work is held and manipulated, the same asin the embodiment irst described herein, and the constructions, other grooved bridges e between their ends. The

radius of each groove is determined by adj usting the headstock either toward or from the operator to throw the axis of the work holder spindle out of line with the axis of the tool a distance equal to the radius desired.

The length of the bridge e, that is, the distance between the ends of the grooves, is predetermined by the adjustment of the stop 68, so that the angle formed by the radii passing through the stops 68, and 62, will equal the angle formed by the radii that pass through the ends of the grooves.

Certain accurate distances must be maintained between the gage hole b or o, of a ring and the ends of the groove, and these are predetermined by the index pins or devices 58 or 59, and by adjusting the work holder main plate 37 on the work holder spindle as a center as permitted by the elongated bolt holes 35, 36 and studs 35a, 36a, and their nuts. 1n other words, the angle between the radius that passes through one end of the groove and the radius that passes through the gage hole b or c, must be a'ccurately predetermined and maintained in the duplicate rings, and also the angle between the radius that passes through said gage hole and the radius that passes through the other end of the groove must be accurately predetermined and maintained in duplicate rings. These angles are predetermined, as just stated by adjusting the plate 37 and then clamping the same rigidly to the work holder spindle in the desired adjustment, to bring the point at which the tool starts cutting the groove, the front end of the groove, in alinement with the axis of the tool. The work holder parts are so adjusted that this starting point on the work will be properly located in alinement with the axis of the tool when the-work holdel1 is held against rotation by the stop 68, engaging the abutment 61, hence when the tool slide is thrown toward the ring by the hand leverl 90, until the adjusting pin 97 engages abutment 96, the rotary routing tool will enter the ring at the proper predetermined starting point and will form the depression or socket that constitutes or forms the front end of the finally completed groove. The stop 68, is then withdrawn by the hand lever 70, and the work holder immediately begins to revolve at the proper speed and in the proper direction to enable the routing tool to cut and complete the groove of the full depth required which it does as the work (the ring) revolves with the work holder.`

The Work holder thus continues to revolve until the work holder abutment 60, strikes the permanent stop 62 and `thereby brings the work holder to rest withthe groove completed and the rear or final end thereof at the predetermined position and relationwith respect to the gagehole and trout or iirst formed end of the groove. The hand lever is then swung to withdraw the cutting tool from operative position. rllhe operator then withdraws the permanent sto-p 62, by means of its hand lever, and the work holder thereupon rotates a distance equal to the length of the bridge between the groove ends, to complete the revolution of the work holder, and to again `bring'the same to the starting pointa rIhe cam shaft is then manipulated to release the clamp holding the grooved ring to the clutch and said ring is thereupon removed.

An ungrooved ring is then placed on the chuck and properly located by the index pin and gage hole and securely clamped by the lever. The grooving operation is then repeated. The grooves are accurately and quickly duplicated in similar rings.

The workholder parts and adjustments are originally set for duplicatingr similar rings, preferably by using a master ring having the gage hole therein and having holes or sockets accurately locating the ends of the grooves to be duplicated in a run of rings as Well as kthe depth of the groove to be cut. 'j

The practice asto the location of the gage holes in fuse rings often varies in different shops according to different speciiications and ring formations, or for other reasons.

In some instances, theseholesare formed in the top of the ring, in other instances, in the bottom of the ring, iny other instances in the side face of the ring, etc. The ylocation of the gage hole in some rings necessitates right hand rotation of the Work holder of our machine, and when this is necessary the headstock is adjusted on the machine bed in a direction away'from the operators stand at the front of the machine, to secure lthe desired radial distance between thecenter of the ring and the starting end of the groove, and so that the tool will operate on the upwardly moving portion of the ring in front of the axis of rotationot the ring. When the work holder is to be thus-rotated clockwise, z'. e. to the right, index pin 59 of the Work holder is located in hole 59a, and the fuse ring is then fitted on the chuck with its gage hole receiving said-pin. It the fuse ring has an edge radial gagehole, the post of, and the plate 37 is adjusted on the Work holder spindle so that the ring holding clamp depends from the chuck7 or particularly so that the stud 36a, is approximately alined with the abutment 6l.

On the other hand, the loca-tion of the gage holes in some rings is such as to require lett hand or anti-clockwise rotation of the work holder. "When this is necessary, the headstock is adjusted toward the operators stand to predetermine the radius of the groove to be cut, and so that the cutting tool will operate on the upwardly moving rear portion of the ring. The plate 66 will be adjusted approximately one half a revolution in the headstock wall so that the adjustable stop 68 will be in the upper half of said plate. The plate 87 will also be adjusted one half a revolution so that the clamping lever will be on the upper halt thereof and the stud 35a approximately alined with the abutment 6l. If the particular ring formation requires use of index pin 58, the holder for said pin will be inserted in socket 57. II" the index pin 59 is to'be used said pin will be located in socket59h.

Our machine is designed foralmost universal adjustment to operate on fuse rings widely varying in size and gage pin location.

Obviously various ring receiving chucks will be employed according to the size and form of the ring to be yoperated on.

While we have shown an embodiment of our invention particularly designed for cutting grooves in fuse rings, yet we do not wish to so limit all features and adaptations of the invention, as the broad features of invention involved are adapted for utilization for various kinds of work vin machinery for Working metals and other materials.

VSuitable mechanism is usually provided to iiood the work and tool with suitable cooling and lubricating liquid during the cutting operation, but we have not deemed it necessary to show mechanism for this purpose.

It is evident that various changes, modications, and variations might be resorted to without departing from the spirit and scope of the invention and hence we do not Wish to limit ourselves to the exact disclosures hereof except as delined by the appended claims.

Desiring to protect our invention in the broadest manner legally possible, what we claim is l. In combination, a headstock, Aa rotary work iolder carried thereby and provided with actuating means, said holdei'provided with starting point and finishing point stops, said headstock provided with means coperating with "said stops to predetermine the point at which the holder starts each operative rotation and the point at which the holder stops such operative rotation, a rciso tary tool holder provided with actuating means and having its axis of rotation parallel With the axis of rotation of the Work holder, means for bringing the Work carried by the Work holder and the tool into operative relation, and means for changing and normally fixing the relative positions of the Work holder and tool holder axes forwardly and rearwardly With respect to the position Where said axes are in alinement.

2. In combination, a headstock, a rotary Work holder carried thereby and provided with actuating means, means for adjusting said headstock transversely With respect to the axis of rotation of the Work holder and for normally maintaining the same in fixed position, a rotary cutting tool holder having actuating means and having an axis of rotation parallel and out of alinenient With the axis of rotation of the Work holder, the axes of rotation of said cutting tool and holder being arranged in the same horizontal plane, a slide carrying said tool holder, and means for moving the slide to carry the tool toward and from the Work holder.

3. In combination, a bed, a headstock mounted on and adjustable transversely of the bed and normally clamped thereto in fixed position, a rotary Work holder mounted in and carried by the headstoclr and projecting longitudinally therefrom and at its front end provided with means for receiving and holding the Work, said headstock and Werl; holder provided with cooperating devices limiting said holder to operative movements each less than a complete revolution and predetermining the starting and stopping points of each operative movement, a slide carried by said bed and provided with means for moving the saine tovvard and from the Work receiving front end of said hol-der, and a rotary shaft carried by said slide and provided with driving means and alsoprovided With means to hold a tool for operation on the Work carried by said holder.

4. In combination, a rotary Work holder provided With driving means, a headstock in which said holder is mounted, said headstock carrying said holder and said means, said head stock and holder. provided With eoperating means limiting each operative stroke of the holder to less than a complete revolution and for predetermining the starting and stopping points of such movements, means for adjusting said headstock transversely with respect to the axis of rota-- tion 0f the holder, and for normally maintaining the same in xed position, and a rotary tool holder having its axis of rotation parallel With the axis of rotation of the Work holder, substantially as described.

5. In combination, a bed, a carrier movable longitudinally thereof and supported thereby, a rotary tool holder shaft mounted in said carrier and provided with operating means and at one end provided With a tool chuck, a rotary Work holder provided With operating means and having mechanism for holding the Work in operative relation With respect to the tool carriedby saidl chuck, said Work holder 4having an index, and means limiting each operative movement of the Work holder to less than a complete revolution and providing an inoperative movement of the Work holder to complete each revolution after an operative movement, said means embodying devices .predetermining the starting and stopping points of the operative movement with respect to each other and each With respect to said index2,

6. In combination, a bed, a headstock mounted thereon, a rotary Work holder carried by and mounted in the headstock and at its front end provided` With means to clamp the Work With its side face exposed to be acted on by a rotary tool, said means being provided with an index to cooperate with a locating point on the Work, said headstock `and holder being provided with cooperating means establishing starting and stopping points for the operating movements of the holder, said points being arranged With respect to each other and each point being arranged with respect to said index, and a rotary tool shaft having its axis of rotation parallel With the axis of rotation of the Work holder and at its end adjacent to the Work holder provided with means to hold `a tool, means for rotating said shaft, and means for longitudinally moving said shaft to carry the tool to and from operative and Withdrawn positions.

7. In combination, a bed, a rotary Work holder arranged longitudinally thereof and at its front end provided With means to hold the Work exposed to be acted on by a tool, a rotary tool shaft arranged longitudinally of the bed and at its end adjacent to the Work holder provided with means for holding the tool to operate on the Work, means for supporting the shaft, means for moving the shaft toward and from the Work, and a headstock carried by and adjustable transversely With respect to the bed, the Work holder being mounted in and carried by the headstoclr, the axes of the tool and holder being maintained in a common horizontal plane, said headstock being adjustable forwardly and rearwardly tocarry the axis of the holder to a point in advance of or to a point behind the axial line of said tool,l said headstock being normally secured in fixed position. Y

8. In combination, a tool holder and its supporting means, a bed, a headstock carried by and adjustable transversely of the bed, `and a rotary Work holder mounted in and carried by the headstock and p-rovided With rotating means, said Work holder projecting longitudinally from the headstock and at its front end provided With means for clamping the Work with its surface exposed for the operation of the tool thereon, said Work holdercomprising a longitudinal spindle and an` end head of enlarged diameter Within the headstock,-the vertical side faces ofsaid head and the opposite Walls of the headstock providing the main bearing of the Work holder, saidmain bearing being of the cone type sustaining longitudinal and radial thrusts of theV Workholder and embodying a longitudinallyadjustable bearing ring to take up `vvear.

49. In combination, a bed, a headstock, and a rotary Work holder carried by the headstock and provided with operating means for rotating the same, said Work holder comprisingan enlarged head Within the headstock and a rotary spindle arranged longitudinally-of the headstock and at one end projecting therefrom and'provided with a central Work centering and receiving chuck and with means for clamping the' Work on the chuck, side faces of said head and headstock forming the main bearing of the Work holder of the cone type, sai-d headstockV being provided With a longitudinally adjustable bearing ring to engage a side face of said head. i

10.'In combination, a bed, a headstock carried thereby, a rotary Work holder mount- Ved in and carried bythe headstock and extending longitudinally therefrom and at its front end, provided With a Work holding chuck, said Work holder provided With an exterior driving gear arranged Within the headstock, a rotary pinion shaft extending into the headstock and provided with a pinion meshing with an-d driving said gear,` and a gear case and bearing adjustably clamped to and carried by the headstock and supportingsaid shaft.

V11. In combination, a bed, a headstock mounted on said bed and adjustable With respect thereto, a 'rotary Work holder carried by and mounted in the headstock, a pinion shaft extending Vinto the headstock and geared .to the Work holder for driving the same, a gear box supportedv by and arranged exteriorly of the headstock and receiving said pinion shaft, said gear box formed With a bearing-forming hub entering and adjustably clamped in the headstock, and driving means forjsaid shaft carried by and mounted in said box.

12. In combination, a bed having a slide- Way, oppositelyarranged longitudinally adjustable stop screws carried by ,said bed, a headstock provided With and carried by a base, said. base being longitudinally adjustable in said slidevvay, said screws controlling the adjustmenty of said *base in said slideway, means normally clamping said base in fixed position on said bed, and a rotary Work holder carried by and mounted in said headstock and projecting therefrom.

13. In Combination, a bed, a headstock rising therefrom and supported thereby, a Work holder carried `by the headstock and mounted therein and projecting longitudinally therefromand at its front end pro-v vided With a Work holding chuck and clamp, means for rotating the Work holder, an index determining the radial line of a locating point on the Work held by the chuck, devices carried by the headstock and Work holder and coperating to predetermine the starting and stopping points of the operated movement of the holder With respect to said index, said means being carried by the headstock, and tool operating and holding means carried by said bed.

14:. In combination, a bed having a transverse slideWay and stop means adjustable longitudinally of said slideWay, a headstock provided with and carried by a base fitted to said slideway, means normally clamping the headstock in fixed position on said bed, the position of said headstock transversely of said bed being determined by said stop means, a rotary Work holder arranged longitudinally 0f said bed and carried by and mounted in said headstock, said bed provided with a fixed upright having aV bearing arranged longitudinally of the'base and opposite said headstock, a slide arranged longitudinally of the bed with its axis parallel with the axis of said holder, said slide being longitudinally movable through said bearing, a hand lever carried by said bed and operatively connected with said slide to move the same longitudinally, and a longitudinal rotary tool shaft mounted in said. slide and at its end adjacent to said holder adapted to receive a routing tool, said shaft being carried into and from operative relation to the Work. carried by the Work holder by the longitudinal movement of said slide.

l5. In combination, a bed at one end hav,- ing a transverse slidevvay and at the other end having an upright provided with a bearing arranged longitudinally and approximately centrally of the bed, an upright headstock, a rotary Work holder arranged longitudinally of the bed and mounted inand carried by the headstock and at one end projecting therefrom and provided with a Work chuck, said headstock carried by and rising from a base, said base adapted to and adjustable longitudinally of said slidevvay to carry the longitudinal axis of said holder to either side of the longitudinal axial line of said bearing, means normally maintaining the headstock in fixed position on said bed, a slide mounted in and slidable longitudinallythrough said bearing, a rotary tool shaft arranged longitudinally of and mounted in said slide and at its end adjacent to said chuck provided With a tool, and means to move the slide longitudinally to carry said shaft and its tool into and from operative relation to the Work held by said chuck, the axes of said holder and tool shaft being maintained in approximately a common horizontal plane.

16. In combination, a bed at one end having an elevated longitudinal bearing, a sleeve slide carried by and longitudinally movable in said bearing, a rotary tool shaft mounted in said slide and projecting from the inner end thereof to receive a tool, an adjustable stop determining the limit of longitudinal movement of the shaft and slide, means to move the slide and its shaft longitudinally, an upright headstock mounted on the opposite end of said bed, means normally maintaining said headstock in fixed position on the bed, said headstock being adjustable in a straight line transversely of the bed, land a rotary Work holder arranged longitudinally of the bed and mounted in and carried by the headstock and at its inner' end adjacent `to the tool carrying end of said shaft provided with a Work chuck.

17. In combination, a support, a longitudinally movable slide carried thereby and movable longitudinally thereof and comprising a laterally projecting yoke and alined sleeves fixed to the yoke, a rotary tool shaft mounted in and extending longitudi nally through one of the sleeves and at its outer end provided with a tool holding chuck and at its opposite end provided with a driving pulley arranged Within said yoke, `an idler pulley arranged in said yoke and alined with said first mentioned pulley and mounted independently of said shaft, and means for reciprocating said slide, said means being applied to said yoke.

18. In combination, a bed provided With projecting portions having separated alined slidevvays, a longitudinally reciprocating slide at its opposite ends confined in and movable through said slideivays and conlined thereby to reciprocation in a fixed longitudinal path, a rotary tool shaft arranged longitudinally in and moving with said slide and between said slideivays provided W'ith rotating means, said shaft at its Aouter end provided with a rotary tool holding chuck, a Work holder arranged opposite ,said chuck and provided With supporting means carried by said bed, an adjustable stop mechanism limiting the movement of the slide 4toivard the Work holder to control the Working depth of the tool, and means for 4moving the slide toward and from the Work holder..

19. In combination, a head stock, supporting means therefor, a rotary Workholder -inounted in and carried by the headstock, means for rotating the Work holder, and stop devices between the Work holder and lieadstock to predetermine certain starting and stopping points of the Work holder during each complete revolution thereof.

20. In combination, a rotary Work holder, continuously rotating gearing for rotating said holder in one direction, supporting means for said holder, means for holding and rotating a rotary cutting tool for operating on the work While being held and rotated by said Work holder, adjustable stop mechanism for predetermining the starting point in each revolution of the Work holder at which the tool begins its operation on the Work, and means predetermining the point in each revolution of the Work- `holder at which the tool ceases its operation on the Work, means being provided whereby the holder can complete each revolution from the last mentioned point to the starting point.

21. In combination, means for holding and moving a tool toward and from the Work, a rotary Work holder provided with driving means and comprising a chuck for holding the Work centered, said chuck having an index, a clamp for securing the Work on the chuck With the face of the Work exposed for operation by said tool as the Work revolves With the Work holder, and-stop devices arranged With respect to said index for controlling the points on the Work at which the tool starts and iinishes its operation thereon during each complete revolution of the work. i

22. Means for holding a piece of Work with its face exposed and forvrotating said Work around a center While a tool is operating on said exposed face, and stop devices for predetermining ythe points at Which the tool begins and inishes its operation on the face of the Work during a Vcomplete revolution of the Work, means being provided Whereby the Workcan complete eachV revolution from the point Where the tool finishes its operation to the point Where the tool is to begin operation, in ,combination with means for holding a `tool for operation on the face of the Work, and means for causing relative movement to bring the tool and work into and from operative relation.

23. Means for cutting a groove in the side Vface o f.a fuse ring having a gage point. comprising a rotary Work holder having ring securing and centering means, and an index to coperate With saidgage point, a rotary tool for cutting said groove, means arranged vvith respect to said index and cooperating with said holder for predetermining the .distances between each groove and the gage point of a ring in which the groove is to be cut, means cooperating with said holder, for predetermining the distance between the groove ends, and means for predetermining the radius .of the grooves.

24. Means `for .Cutting a groove in the .Side 

